| Callsign structure # | Callsign structure, C - char, D - digit | Example | Callsigns | % | QSOs | % |
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1 | C D C C C | K0AOM | 77 | 40.74 % | | 78 | 41.05 % | | 2 | C D C C | K0RC | 47 | 24.87 % | | 47 | 24.74 % | | 3 | C C D C C C | KB4PIX | 28 | 14.81 % | | 28 | 14.74 % | | 4 | C C D C C | AC8RC | 14 | 7.41 % | | 14 | 7.37 % | | 5 | C C D C | AF0S | 14 | 7.41 % | | 14 | 7.37 % | | 6 | C D C | K5R | 9 | 4.76 % | | 9 | 4.74 % | |
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